Field features and petrography used as indicators for the classification of Shigar valley pegmatites, Gilgit-Baltistan region of Pakistan | Journal of Himalayan Earth Sciences 2011

Author(s)

M. Tahir Shah National centre of Excellence in Geology, University of Peshawar, Peshawar, PAKISTAN

Tahseenullah Khan Department of Earth & Environmental Sciences, Bahria University, Islamabad, PAKISTAN

M. Hassan Agheem Centre for Pure & Applied Geology, University of Sindh, Jamshoro, PAKISTAN

Amanullah Laghari Centre for Pure & Applied Geology, University of Sindh, Jamshoro, PAKISTAN

Humaira Dars Centre for Pure & Applied Geology, University of Sindh, Jamshoro, PAKISTAN

Abstract

On the basis of field features and petrography, Shigar valley pegmatites are classified broadly into Group-I and Group-II pegmatites. The Group-I pegmatites are further divided into muscovite-schorl-beryl-garnet pegmatites and muscovite-schorl pegmatites. The muscovite-schorl-beryl-garnet pegmatites are more productive for gemstones. The Group-II pegmatites are classified as biotite ± garnet ± muscovite pegmatites and muscovite-biotite ± garnet pegmatites. The complete absence of biotite and the higher percentage of muscovite in the gemstone bearing class of pegmatites can be used as indicators for gemstone exploration.

Publication Details

Page(s) 1-7

DOI DOI not available

Published Journal: Journal of Himalayan Earth Sciences, Volume: 44, Issue: 2, Year: 2011

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